Java exception method overriding problem with a parent class

1. The method in the parent class throws an exception, if the subclass wants to overwrite the method can only throw the same exception or the exception of the subclass or do not throw the exception, the reason is very simple, considering the polymorphism, we often use the parent class reference call method, and according to the definition of the parent class method to catch the exception, when we are the object of the class If the method of the parent class overrides the quilt class and throws a different exception, the exception cannot capture the intent that caused the program to fail to achieve the previous design.
   

2. Exception can be lost if handled improperly. For example, the throw exception in finally overwrites the exception that occurred in the previous try
   

Java exception method overriding problem with a parent class